Conservator Tank for Power Transformers | Specifications & Selection

Product Specifications

Technical details and manufacturing context for Conservator Tank

Definition

The conservator tank is a critical component of oil-immersed power transformers, serving as an expansion reservoir for insulating oil. It maintains proper oil levels by compensating for thermal expansion and contraction, preventing pressure buildup and ensuring consistent insulation performance. Connected to the main transformer tank via piping, it typically includes a breather system to manage moisture ingress and may incorporate features like silica gel breathers or nitrogen blankets for enhanced protection.

In operation, as transformer oil heats up, it expands and flows into the conservator tank through connecting pipes. When the oil cools and contracts, oil returns from the conservator to the main tank. This cycle maintains a constant oil level in the main transformer tank while preventing excessive pressure variations. Many conservators include a breather system that allows air exchange while removing moisture through desiccant materials.

Conservator tanks are typically fabricated from carbon steel or stainless steel, with wall thicknesses ranging from 3 to 8 mm. Rated capacity varies from 100 to 10,000 liters, depending on transformer oil volume. Operating pressure is set between 0.1 and 0.5 MPa, with a design temperature range of -40°C to 85°C. Leak rate is specified as ≤0.1 Pa·m³/s, tested via helium mass spectrometer. Material grades include Q235B carbon steel, with corrosion protection per ISO 12944 (C3–C5) and ingress protection per IEC 60529 (IP54–IP65). Weight ranges from 200 to 5,000 kg, and dimensions vary from 1000×600×800 mm to 4000×2000×2500 mm.

When selecting a conservator tank, verify model-specific values and standards with the legal manufacturer or supplier. Confirm rated capacity matches transformer oil volume, operating pressure aligns with system requirements, and materials suit the installation environment. Check that the breather system is appropriate for moisture control and that the tank meets applicable standards such as GB/T 6451, GB/T 709, and GB/T 700. Always validate leak rate, corrosion protection, and ingress protection for the specific application.

Working Principle

As transformer oil heats up during operation, it expands and flows into the conservator tank through connecting pipes. When the oil cools and contracts, oil returns from the conservator to the main tank. This expansion/contraction cycle maintains a constant oil level in the main transformer tank while preventing excessive pressure variations. Many conservators include a breather system that allows air exchange while removing moisture through desiccant materials.

Common Materials

Carbon steel, Stainless steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	100–10000 L	Matches transformer oil volume; larger for higher ratings.
Operating Pressure	0.1–0.5 MPa	Sealed system; relief valve set above max.GB/T 6451
Design Temperature Range	-40–85 °C	Ensures oil expansion/contraction accommodation.
Leak Rate	≤0.1 Pa·m³/s	Helium mass spectrometer test; zero leakage preferred.GB/T 6451
Wall Thickness	3–8 mm	Steel plate; thicker for larger tanks.GB/T 709
Material Grade	Q235B	Carbon steel; stainless for corrosive environments.GB/T 700
Corrosion Protection	C3–C5	Coating system per environment.ISO 12944
Ingress Protection	IP54–IP65	Dust-tight and water-resistant.IEC 60529
Weight	200–5000 kg	Depends on capacity and material.
Dimensions (L×W×H)	1000×600×800–4000×2000×2500 mm	Customizable to site constraints.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Tank Body
Main cylindrical structure that contains the expanding oil

Material: Carbon steel
Breather Assembly
Allows air exchange while removing moisture through desiccant

Material: Plastic/Metal with silica gel
Oil Level Indicator
Visual or remote monitoring of oil level within the conservator

Material: Glass/Plastic with magnetic components
Connecting Pipes Part
Transports oil between main transformer tank and conservator

Material: Steel
Drain Valve
Allows for oil drainage during maintenance

Material: Brass/Stainless steel
Desiccant
Dries the air drawn in through the breather so moisture does not reach the oil.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Conservator Tank.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Power Transformers

View system integration details

Manufacturers of Conservator Tank

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Shaanxi ShengKe Electronic Technology Co., Ltd.

Jilin, CN

Also makes: Liquid Level Sensor, Water Level Sensor, Level Transmitter and 6 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the primary function of a conservator tank?

It accommodates thermal expansion and contraction of transformer oil, maintaining proper oil level and preventing pressure buildup in the main tank.

What materials are commonly used for conservator tanks?

Carbon steel (e.g., Q235B) and stainless steel are typical. Material choice depends on corrosion requirements and environment.

How is leak tightness verified?

Leak rate is tested using a helium mass spectrometer, with a specified maximum of 0.1 Pa·m³/s. Confirm the test method and acceptance criteria with the supplier.

What standards apply to conservator tanks?

Relevant standards include GB/T 6451 for oil-immersed transformers, GB/T 709 for steel plates, GB/T 700 for carbon steel, ISO 12944 for corrosion protection, and IEC 60529 for ingress protection. Verify compliance with the manufacturer.

Data Basis

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Preliminary Technical Classification

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pressure:	0.5 to 1.5 bar (gauge) with pressure relief valve protection
other spec:	Oil expansion volume: 5-15% of total transformer oil volume, nitrogen blanket pressure: 0.2-0.5 bar
temperature:	-40°C to +120°C (typical transformer oil operating range)

Conservator Tank

Product Specifications

Industry Taxonomies & Aliases

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